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. 2016 Jun;10(6):CC01-4.
doi: 10.7860/JCDR/2016/17229.7976. Epub 2016 Jun 1.

Anthropometric Predictors of Bio-Impedance Analysis (BIA) Phase Angle in Healthy Adults

Nazeem Ishrat Siddiqui  1 , Sarfaraz Alam Khan  2 , Mohammad Shoeb  3 , Sukhwant Bose  4
Affiliations

Anthropometric Predictors of Bio-Impedance Analysis (BIA) Phase Angle in Healthy Adults

Nazeem Ishrat Siddiqui et al. J Clin Diagn Res. 2016 Jun.

Abstract

Introduction: Phase Angle (PhA) is a ratio of whole body reactance and resistance obtained from Bioelectrical Impedance Analysis (BIA). It indicates cellular health and integrity and is considered as prognostic tool in medical disorders. In spite of prognostic potentials of PhA, it has limited usefulness in clinical practice and in population studies because of non-availability of normal population reference limits for comparison. Moreover, it is influenced by various factors like age, sex, race and body composition (i.e. body fat, muscle mass, visceral fat, body cell mass, total body water, etc).

Aim: The aim of this study was to evaluate predictors of phase angle which will be useful in formulation of reference values for Indian population.

Materials and methods: BIA was performed by Tanita Body Composition Analyser on healthy adults aged 17-24 years. The inbuilt software measured the phase angle by the formula: Phase angle (PhA) = Reactance (xc)/Resistance (R)* (180/π). Phase angle values were compared across categories of age, sex, weight, height, Body Mass Index (BMI), total fat, visceral fat and muscle mass.

Results: Mean value of phase angle was found to be 5.65. Phase angle was significantly (p< 0.001) higher in male than in female. Phase angle was significantly predicted from height (p< 0.001), weight (p< 0.002), muscle mass (p< 0.002) and visceral fat (p< 0.02) in multiple regression models.

Conclusion: Phase angle differs across anthropometric and body composition categories. Thus height, weight and muscle mass should also be taken into consideration while deriving population specific reference limits of phase angle.

Keywords: Anthropometric predictors; Bio-Impedance Analysis; Body composition analysis; Phase angle; Reactance and resistance.

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Figures

[Table/Fig-1]:
[Table/Fig-1]:
Electrode placement and standard positioning for BIA measurement. (Figure source: Tanita MC 180MA instruction manual, Tanita corp Tokyo Japan).
[Table/Fig-3]:
[Table/Fig-3]:
Box and Whiskar diagram showing mean Phase angle values for different ages with 95% confidance interwal.
See this image and copyright information in PMC

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